Abstract：The influence of cooling/lubrication conditions on the tool wear, hole quality, and thrust force was analyzed using minimal quantity lubrication (MQL) and dry drilling for drilling carbon fiber reinforced plastic (CFRP) and aluminum stacks. A mechanical model was developed to analyze the increase in the thrust force and the hole quality characteristics with the number of holes when drilling CFRP layers. The relationships between the built-up edge (BUE), chip separation mechanism, and thrust force were also analyzed. The results show that the BUE influences the thrust force for the CFRP layer by changing the chisel edge real working length, BUE angle, friction angle, and stress states in the real shear plane of the carbon fiber. The differences between the thrust forces at the chisel edge with MQL and dry drilling are the main effects influencing the resultant thrust force. The carbon fibers with the high hardness extruded cutting edges break the BUE continuity which worsens the stack holes quality. MQL improves the machining quality for CFRP/Al stack drilling compared with dry drilling.
张玉玺, 吴丹, 杨亚鹏, 马信国, 梁雄. 冷却润滑方式对CFRP/Al叠层钻孔质量及轴向力的影响[J]. 清华大学学报（自然科学版）, 2018, 58(4): 402-410.
ZHANG Yuxi, WU Dan, YANG Yapeng, MA Xinguo, LIANG Xiong. Influence of cooling/lubrication conditions on the drilling quality and thrust force of CFRP/Al stacks. Journal of Tsinghua University(Science and Technology), 2018, 58(4): 402-410.
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2018, Vol. 58 
